Find the equation of the tangent line to the graph of fix} at the given point. rm = he: + as at {1,8} The equation of the tangent line to the graph of x} at the given point is D. Afence must be built to enclose a rectangular area of 45,000 112. Fencing material costs $2 per foot for the two sides facing north and south and $4 per foot for the other two sides. Find the cost of the least expensive fenoe. The cost of the least expensive fence is $1. (Simplify,r your answer.)